Cellphone device not delivered to MTN

I received a call from Summer Mobile on 15 August 2017 regarding my upgrade. I accepted but then went into a MTN store and saw that Summer Mobile pitched me a deal including a dex station. I cancelled the upgrade by the 17 August 2017 and was told that within 2 days I can go into an MTN STORE and do my upgrade via the counter. Despite contacting and emailing MTN and summer mobile on numerous times trying to find out if the upgrade cellphone was which I cancelled was delivered to MTN - No one can tell me were the my package is or who is responsible for my package. A lot of emails have been sent but still no luck! I had enough and need help!